The Mossad knew about the planned attack on 9/11 and LIHOP.

The Israeli Art Student Files

http://antiwar.com/israeli-files.php

The Mossad knew, and so did many Arabs in the USA.

http://www.theconservativevoice.com/article/18261.html

I find this 100% beliveable considering the Mossad was also responsible for the Iran/Contra affair. After reading " By Way of Deception" the Making of a Mossad Agent, I can see them having their hands in anything that has to do with the Middle East.